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采用角度磨抛的方式,在纤芯/包层为20/400μm双包层掺Yb光纤上制作了侧面抽运耦合器.该耦合器对975 nm的半导体二极管抽运光的耦合效率最高可达97%,对1080 nm信号光的泄漏比小于2%.分析了侧面抽运耦合器的性能以及多个侧面抽运耦合器的级联分布对抽运耦合效率的影响;同时,在前向抽运和双向抽运方式下,分析了级联耦合器的分布及信号光泄漏比对激光器整体效率的影响,并进行了数值模拟.采用自行研制的侧面抽运耦合器,搭建了侧面耦合分布式抽运、掺Yb双包层全光纤主振荡功率放大器,获得了波长为1080 nm、功率为303 W的基模激光输出.进一步增加抽运点个数,提高抽运功率,可获得更高的输出功率.
A side-pumping coupler is fabricated on a 20/400 μm double-clad Yb fiber with a core / cladding layer by means of angle grinding and polishing.The coupler has the highest coupling efficiency for 975 nm diode-pumped light 97%, and the leak ratio of signal light at 1080 nm is less than 2% .The influence of the performance of side-pumping coupler and the cascade distribution of multiple side-pumping couplers on pumping coupling efficiency are analyzed. In the meantime, The effects of cascaded coupler distribution and signal light leakage ratio on the overall efficiency of the laser were analyzed and numerically simulated.A side coupling coupler Pumping and mixing Yb double-clad all-optical main oscillator power amplifier to obtain a fundamental mode laser output with a wavelength of 1080 nm and a power of 303 W. Further increasing the number of pumping points and increasing the pumping power can achieve higher Output Power.